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Tái sử dụng nước Một định nghĩa thường được chấp nhận tái sử dụng nước là các nước sẽ tiếp tục được sử dụng vẫn sẽ được dưới sự kiểm soát của người sử dụng đầu tiên. Một ví dụ đầu của tái sử dụng nước liên quan đến việc bán nước thải thứ cấp, nước thải từ nhà máy xử Trở lại sông ở Baltimore điểm Sparrows Nhà máy thép Bethlehem. Nhà máy Sparrows Point được phục vụ bởi các giếng nước, được gần lợ Baltimore Harbor | WATER REUSE A commonly accepted definition of water reuse is that the water that will be further utilized will still be under the control of the first user. An early example of water reuse involved the sale of secondary wastewater effluent from the Back River Treatment Plant in Baltimore to the Bethlehem Steel Sparrows Point Plant. The Sparrows Point Plant was served by wells which were close to brackish Baltimore Harbor. Excessive pumping of the wells led to saltwater intrusion and low saltwater concentrations made the well water unsuitable for some operations. Steel rollers pit when applied water contains 5 mg l chloride ion. Wolman recommended that the treated wastewater effluent be used for some rough operations such as quenching. An 8-mile pipeline was installed to carry the effluent to the industrial plant. Drawdown on the wells was reduced significantly and the city of Baltimore received revenue for a previously discarded product. Water reuse can be regarded as a conservation strategy. Here the discussion will deal with reclamation of used water. Desalination or desalting is covered in another chapter see Desalination . Guidelines and design standards have been developed for water reclamation and water reuse as alternatives to disposal of surface receiving waters. Table 1 lists water-reuse applications. It should be noted that other uses will be found. All water is reused. It may be used and used again in its journey from deposition as rain to eventual mixing with the sea. Available water is not always near the point at which it is required. Economics of supply is important and pumping cost may dictate the source chosen. In many cases water for industrial processes must be of much higher quality than that used for drinking. In waterpoor areas reused water has long been accepted even for drinking. In general however public-health authorities have not looked favorably on this use. A poll found that 50 of the people surveyed did favor reclaimed water for .
